/**
 * \file  cmdline.c
 *
 * \brief Functions to help with processing command lines.
 */

/* Copyright (c) 2007-2010 Texas Instruments Incorporated.  All rights reserved.
 *
 * Software License Agreement
 *
 * Texas Instruments (TI) is supplying this software for use solely and
 * exclusively on TI's microcontroller products. The software is owned by
 * TI and/or its suppliers, and is protected under applicable copyright
 * laws. You may not combine this software with "viral" open-source
 * software in order to form a larger program.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
 * NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
 * NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
 * CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
 * DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 * This is part of revision 6288 of the Stellaris Firmware Development
 * Package. */

/**
 * \addtogroup cmdline_api
 * @{
 */

#include <string.h>

#include "cmdline.h"

/* Defines the maximum number of arguments that can be parsed. */
#define CMDLINE_MAX_ARGS	4

/**
 * Process a command line string into arguments and execute the command.
 *
 * \param pcCmdLine points to a string that contains a command line that was
 * obtained by an application by some means.
 *
 * This function will take the supplied command line string and break it up
 * into individual arguments.  The first argument is treated as a command and
 * is searched for in the command table.  If the command is found, then the
 * command function is called and all of the command line arguments are passed
 * in the normal argc, argv form.
 *
 * The command table is contained in an array named <tt>g_sCmdTable</tt> which
 * must be provided by the application.
 *
 * \return Returns \b CMDLINE_BAD_CMD if the command is not found,
 * \b CMDLINE_TOO_MANY_ARGS if there are more arguments than can be parsed.
 * Otherwise it returns the code that was returned by the command function.
 */
extern int cmd_entry_hook(tCmdLineEntry *pCmdEntry, int argc, char **argv);
 
int CmdLineProcess(char *pcCmdLine)
{
    static char *argv[CMDLINE_MAX_ARGS + 1];
    char *pcChar;
    int argc;
    int bFindArg = 1;
    tCmdLineEntry *pCmdEntry;

    /* Initialize the argument counter, and point to the beginning of the
     * command line string. */
    argc = 0;
    pcChar = pcCmdLine;

    /* Advance through the command line until a zero character is found. */
    while(*pcChar)
    {
        /* If there is a space, then replace it with a zero, and set the flag
         * to search for the next argument. */
        if(*pcChar == ' ')
        {
            *pcChar = 0;
            bFindArg = 1;
        }

        /* Otherwise it is not a space, so it must be a character that is part
         * of an argument. */
        else
        {
            /* If bFindArg is set, then that means we are looking for the start
             * of the next argument. */
            if(bFindArg)
            {
                /* As long as the maximum number of arguments has not been
                 * reached, then save the pointer to the start of this new arg
                 * in the argv array, and increment the count of args, argc. */
                if(argc < CMDLINE_MAX_ARGS)
                {
                    argv[argc] = pcChar;
                    argc++;
                    bFindArg = 0;
                }

                /* The maximum number of arguments has been reached so return
                 * the error. */
                else
                {
                    return(CMDLINE_TOO_MANY_ARGS);
                }
            }
        }

        /* Advance to the next character in the command line. */
        pcChar++;
    }

    /* If one or more arguments was found, then process the command. */
    if(argc)
    {
        /* Start at the beginning of the command table, to look for a matching
         * command. */
        pCmdEntry = &g_sCmdTable[0];

        /* Search through the command table until a null command string is
         * found, which marks the end of the table. */
        while(pCmdEntry->pcCmd)
        {
            /* If this command entry command string matches argv[0], then call
             * the function for this command, passing the command line
             * arguments. */
            if(!strcmp(argv[0], pCmdEntry->pcCmd))
            {
                //return(pCmdEntry->pfnCmd(argc, argv));
				return cmd_entry_hook(pCmdEntry, argc, argv);
            }

            /* Not found, so advance to the next entry. */
            pCmdEntry++;
        }
    }

    /* Fall through to here means that no matching command was found, so return
     * an error. */
	cmd_entry_hook(NULL, 0, NULL);
	//usart_dbg_string("\r\n");
	//usart_dbg_string(argv[0]);
    return(CMDLINE_BAD_CMD);
}

/* Close the Doxygen group. */
/** @} */
